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In this final module, we push the limits of clinical MRI. From the microscopic motion of water (Diffusion) to the metabolic chemical shifts of energetics (Spectroscopy), this is the advanced physics that defines modern cardiac research.
Diffusion MRI is common in neurology for stroke detection, but it is notoriously difficult in the heart due to cardiac and respiratory motion. When successful, it provides direct information about myocardial fiber architecture and acute cellular swelling (edema) without the need for contrast.
While imaging usually looks at protons in water, spectroscopy distinguishes protons (or Phosphorous-31) in different metabolic states. For the heart, we look at the high-energy reservoir PCr and the working fuel ATP. A low PCr/ATP ratio is the ultimate measure of "energetic failure."
You have completed the exhaustive MRI Physics Masterclass. From the basic proton spin to the complexities of 31P-Spectroscopy, you are now prepared for clinical excellence and board success.